我無法下載任何文件,下面的代碼:通過System.Net.WebClient DownloadFile不工作
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
DownloadFile("http://mirror.switch.ch/ftp/mirror/videolan/vlc/2.0.3/vlc-2.0.3.tar.xz", "C:\TEST\vlc-2.0.3.tar.xz")
End Sub
Public Sub DownloadFile(ByVal _URL As String, ByVal _SaveAs As String)
Dim _WebClient As New System.Net.WebClient()
_WebClient.DownloadFile(_URL, _SaveAs)
End Sub
以下錯誤會彈出:(德國翻譯成英文):
從Microsoft錯誤彈出:
==>類型System.Net.WebException的一個未處理的exeption出現在System.dll中。
,並在調試器:
==> Exeption:觸發: 「無效的參數已經被指定」(System.Net.Sockets.SocketException)System.Net.Sockets.SocketException已被觸發。 「無效的參數已經被指定爲」
全碼:
Imports System
Imports System.Net
Public Class Form2
Dim str_hd As String
Private Sub Form2_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
For Each drive As System.IO.DriveInfo In My.Computer.FileSystem.Drives
Dim dbl_capacity As Double
Dim dbl_free As Double
Dim dbl_used As Double
If drive.IsReady Then
dbl_capacity = drive.TotalSize/1073741824
dbl_free = drive.TotalFreeSpace/1073741824
dbl_used = dbl_capacity - dbl_free
dbl_capacity = Fix(dbl_capacity * 1)/1
dbl_free = Fix(dbl_free * 10)/10
dbl_used = Fix(dbl_used * 10)/10
str_hd = str_hd & "Laufwerk " & drive.Name & " - " _
& drive.VolumeLabel & vbCrLf _
& "Benutzt: " & dbl_used & " GB" & "/" & dbl_capacity & " GB" & vbCrLf & "Frei: " _
& dbl_free & "GB" & vbCrLf & "-------------------------------" & vbCrLf
End If
Next
txtbox_hd.Text = str_hd
End Sub
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Form1.Close()
End Sub
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
DownloadFile("http://www.aerztekammer-hamburg.de/berufsrecht/Berufsordnung.pdf", "C:\TEST\Berufsordnung.pdf")
End Sub
Public Sub DownloadFile(ByVal _URL As String, ByVal _SaveAs As String)
Dim _WebClient As New System.Net.WebClient()
_WebClient.DownloadFile(_URL, _SaveAs)
End Sub
End Class
是的,文件夾「C:\ TEST」存在。我怎樣才能爲此設置一個帳戶?當您在瀏覽器中鍵入給定的url時,該文件將被下載而沒有權限檢查... –
您是否正在創建ASP.NET頁面?如果Internet信息服務沒有對該文件夾的寫入權限,則上述操作僅會創建一個錯誤。 –
Nop,我沒有創建任何ASP.NET頁面。我只嘗試從它的ftp服務器下載該文件。我會在1分鐘添加完整代碼.. –